CSE326 Unit-4 MCQ Test

Question 1

Which keyword is used to declare a variable with block scope in JavaScript?

A var B let C const D static

Question 2

Which JavaScript keyword is used to declare a constant variable?

A var B let C const D fixed

Question 3

What is the correct syntax to define a function in JavaScript?

A function = myFunc() {} B function myFunc() {} C def myFunc() {} D create myFunc() {}

Question 4

Which statement is used to return a value from a function?

A break B continue C return D output

Question 5

How do you call a function named myFunction in JavaScript?

A call myFunction B call(myFunction) C myFunction() D run myFunction

Question 6

Which JavaScript event occurs when a button is clicked?

A onmouseover B onsubmit C onclick D onload

Question 7

Which event is triggered when a page finishes loading?

A onclick B onload C onsubmit D onfocus

Question 8

Which JavaScript dialog box is used to show a warning message?

A prompt() B confirm() C alert() D message()

Question 9

Which dialog box returns true or false based on user action?

A alert() B prompt() C confirm() D message()

Question 10

Which dialog box is used to take input from the user?

A alert() B confirm() C prompt() D input()

Question 11

Which JavaScript operator is used to compare both value and type?

A == B = C === D !=

Question 12

Which loop executes at least once even if the condition is false?

A for B while C do...while D foreach

Question 13

Which JavaScript statement is used to stop a loop?

A stop B exit C break D end

Question 14

Which keyword is used to skip the current iteration of a loop?

A pass B skip C continue D break

Question 15

What will typeof null return in JavaScript?

A null B undefined C object D number

Question 16

Which event is triggered when the user submits a form?

A onclick B onsubmit C onfocus D onchange

Question 17

Which method is used to convert a string to an integer?

A parseInt() B parseFloat() C Number() D String()

Question 18

Which symbol is used for single-line comments in JavaScript?

A  B /* */ C // D #

Question 19

Which JavaScript object is used to work with dates?

A Time B Calendar C Date D Clock

Question 20

Which function is used to check whether a value is NaN?

A isNan() B checkNaN() C isNaN() D NaN()

Question 21

Which keyword is used to define a JavaScript function parameter?

A param B argument C function D No keyword is required

Question 22

What is the default return value of a JavaScript function if no return statement is used?

A 0 B null C undefined D false

Question 23

Which event occurs when an input field loses focus?

A onfocus B onblur C onchange D oninput

Question 24

Which event is triggered when the value of an input field changes?

A onfocus B onclick C onchange D onsubmit

Question 25

Which JavaScript method is used to access an HTML element by its ID?

A getElement() B getElementById() C queryElement() D selectById()

Question 26

Which object is the top-level object in JavaScript?

A document B window C screen D navigator

Question 27

Which JavaScript function converts a string to a floating-point number?

A parseInt() B parseFloat() C NumberInt() D float()

Question 28

Which symbol is used to create an object in JavaScript?

A [] B () C {} D <>

Question 29

Which method displays a message and waits for user input?

A alert() B confirm() C prompt() D message()

Question 30

Which JavaScript keyword is used to handle exceptions?

A error B handle C try D exception

📝 CSE326 Unit-4 MCQ Test

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